diff -ruN rasqal-0.9.33.orig/configure rasqal-0.9.33/configure
--- rasqal-0.9.33.orig/configure	2023-01-23 13:14:38.861781072 +0100
+++ rasqal-0.9.33/configure	2023-01-23 16:57:03.874250005 +0100
@@ -13712,6 +13712,7 @@
 $as_echo_n "checking whether __FUNCTION__ is available... " >&6; }
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
+extern int printf(const char *);
 int main() { printf(__FUNCTION__); }
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
diff -ruN rasqal-0.9.33.orig/configure.ac rasqal-0.9.33/configure.ac
--- rasqal-0.9.33.orig/configure.ac	2014-11-23 23:11:33.000000000 +0100
+++ rasqal-0.9.33/configure.ac	2023-01-23 15:49:44.885025978 +0100
@@ -312,7 +312,7 @@
 AC_C_BIGENDIAN
 
 AC_MSG_CHECKING(whether __FUNCTION__ is available)
-AC_COMPILE_IFELSE([AC_LANG_SOURCE([int main() { printf(__FUNCTION__); }])],
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([extern int printf(const char *s); int main() { printf(__FUNCTION__); }])],
     [AC_DEFINE([HAVE___FUNCTION__], [1], [Is __FUNCTION__ available])
      AC_MSG_RESULT(yes)],
     [AC_MSG_RESULT(no)])